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Figure 3-2. Performance lapses for time in bed (TIB) over 14 days of sleep restriction.[1]

Skylab in the summer of 1973

The mission's capsule in a museum. The crew did return safely to Earth after 84 days in space.

A Skylab crew on spacewalk in February 1974

Skylab 4 command and service module docked with Skylab. This was a version of the Apollo CSM

Skylab seen as the crew departs, February 1974

A work slowdown, characterized by some writers as the Skylab strike or the Skylab Mutiny, was instigated by the crew of Skylab 4 during some or all of December 28, 1973—the last of the U.S. National Aeronautics and Space Administration's Skylab missions.[2][3][unreliable source?] The three-man crew, Gerald P. Carr, Edward G. Gibson, and William R. Pogue, turned off radio communications with NASA ground control and spent time relaxing and looking at the Earth before resuming communication with NASA,[3] refusing communications from mission control during this period. Once communications resumed, there were discussions between the crew and NASA, and the mission continued for several more weeks before the crew returned to Earth in 1974. The 84-day mission was Skylab's last crew, and last time American astronauts set foot in a space station for two decades, until Shuttle–Mir in the 1990s.

The event, which the involved astronauts have joked about,[4] has been extensively studied as a case study in various fields of endeavor including space medicine, team management, and psychology. Man-hours in space was, and continued to be into the 21st century, a profoundly expensive undertaking; a single day on Skylab was worth about $22.4 million in 2017 dollars, and thus any work stoppage was considered inappropriate due to the expense.[5] The incident affected the planning of future space missions, especially long-term missions.[6]

Contents

Behavioral problems during a spaceflight are of concern to mission planners because they can cause a mission to fail.[7] NASA has studied matters that affect crew social dynamics such as morale, stress management, and how the crew solves problems as a group with missions like HI-SEAS.[8] Each Skylab pushed farther into the unknown of space medicine, and it was difficult to make predictions about the reaction of the human body to prolonged weightlessness.[9] The first manned Skylab mission set a spaceflight record with its 28-day mission, and Skylab 3 roughly doubled that to 59 days; no one had spent this long in orbit.[9]

Possible contributing factors to the incident include:

Twelve-week length of stay (the longest stay yet attempted by astronauts up to that time)

Isolated environment

Design of the spacecraft

Microgravity environment

Workload expectations of Skylab team

Workload expectations of mission control

Crew inexperience (all first-time astronauts)

No transition period

Three three-man crews spent progressively longer amounts of time (28, 60, and then 84 days), launched to orbit by the Saturn IB and flying the Apollo CSM spacecraft to the station.[10] It was visited by three three-man crews, and the incident occurred on this last all-rookie mission, which was also the longest.[11]

Skylab 3 had finished all their work and asked for more work—this may have led NASA to have a higher expectation for the next crew.[12] However, the next crew were all "rookies" (they had not been in space before) and may not have had the same concept of workload as the previous crew.[12] Both previous crews had veteran members and both previous crews had one member that had been to the Moon and back.[12] Another factor was that the rookie astronauts were in denial about their problems and hid the issues they were having with mission control, leading to even higher mental strain.[12] The crew increasingly became bothered by having every hour of their trip duration scheduled.[13]

NASA had continued with a workload similar to that on the shorter Skylab 3,[14] and the crew gradually fell behind on their workload. According to some, after six weeks the crew announced a "strike" and turned off all communication with ground control for December 28, 1973.[3][unreliable source?] To date, no evidence of this announcement has been located in mission transcripts or audio recordings of the flight.

The three men are alleged to have stopped work; Gibson spent the day on Skylab's solar console, and Carr and Pogue spent the time in the wardroom looking out of the window.[15][unreliable source?]

At a time when nobody had spent six weeks in space, it was not known what had happened psychologically. NASA carefully worked with crew's requests, reducing their workload for the next six weeks. The incident took NASA into an unknown realm of concern in the selection of astronauts, still a question as humanity considers human missions to Mars or returning to the Moon.[17]

After the incident, there were many attempts to either determine the cause or downplay what happened.[12] Nevertheless, lessons learned focused on balancing workload with crew psychology and stress level.[12] One factor that affects disaster planning is the process of lessons learned from past incidents.[18] Two contrasting pressures are the desire to hide a problem to avoid issues such as reprimands versus the honest evaluation of the issue to prevent future occurrences.[18]

Among the complicating factors was the interplay between management and subordinates (see also Apollo 1 fire and Challenger disaster). On Skylab 4, one problem was that the crew was pushed even harder as they fell behind on their workload, creating an increasing level of stress.[19] Even though none of the astronauts returned to space, there was only one more NASA spaceflight in the decade and Skylab was the first and last all-American space station.[11] NASA was planning larger space stations but its budget shrank considerably after the Moon landings, and the Skylab orbital workshop was the only major execution of Apollo application projects.[11]

Though the final Skylab mission became known for the incident, it was also known for the large amount of work that was accomplished in the long mission.[6] Skylab orbited for six more years before decaying in 1979 due to higher-than-anticipated solar activity.[12] The next U.S. spaceflight was the Apollo–Soyuz Test Project conducted in July 1975, and after a human spaceflight gap, the first Space Shuttle orbital flight STS-1.

The described events were considered a significant example of "us" versus "them" syndrome in space medicine.[14] Crew psychology has been a point of study for Mars analog missions such as Mars-500, with a particular focus on crew behavior triggering a mission failure or other issues.[14] One of the impacts of the incident is the requirement that at least one member of the International Space Station crew be a space veteran (not be on a first flight).[20]

The 84-day stay of the Skylab 4 mission was a human spaceflight record that was not exceeded for over two decades by a NASA astronaut;[21] the 96-day Soviet Salyut 6 EO-1 mission broke Skylab 4's record in 1978.[22]

The Skylab ‘mutiny’ helped planners realise the complexities of prolonged living in space